Safety starting-crank for explosive-motors.



\ G. R. ELLIS. SAFETY STARTING CRANK FOR EXPLOSIYE MOTORS.

I APPLICATION FILED AUG. 22, 1910.

. 1,007 775. Patented Nov. 7,1911.

llllllllllll M rum" i OFFICE.

CHARLES R. ELL'lfiJ,

0F STOCKTON, CALQ'EFORNIA.

SAFETY STARTING-GREEK FEB IEXfELGSIV'E-MOTORS.

Specification of Letters Patent.

Application. filed August 212, 1910. Serial No. 578,417.

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Sis-to of California; have invented certain and useful Improvements inSafety Slburif g-ilranks for Explosive-Motors; and

.l do declare the following, to be a full, clear and exact descriptionof the some, such. as i will enable ol-hers skilled in the m to which itappertnins to make and use the seme,reference being had be theaccompanying draw ings, and to the characters of reference markedthereon, which form a. part of this application.

This invention. relates to improvements in explosive moc'ors andparticularly to the starting cranks thereon, the object of the inventionbeing to produce such a. starting crank as will not throw beck-when themotor buck fires but will remain stationary dun ing such. beck fire.

A further object of the invention is to produce a. simple andinexpensive device, and yet one which. will be exceedingly ef fectivefor the purposes for which it is do signed.

These objects I accomplish by means of such structureendrelativearrangement of x parts as Will fully appear by a perusal ofthe following specification end claims.

In. the drawings similar characters of reference indicate correspondingparts in the several views.

' Figure 1 1s a side elevation of y J iroved startln crank. Elm 2 1s averiicel longitudinal section of the some. Fig.

3 is u side elevation of the interior of the crank proper. Fig; 4sectional view taken on s'line of Fig, Fig. 5 is u .i'ront elevciion oic Michel; host and dogs therein. Fig. 6 is c, from; elevstion of aninternal ratchet Wheel. Fig; 7 is a side elevation of supporting box.Fig.

8 is a front elevation of the crank shaft of the motor showing a pawlcarrying box thereon l llg ll is e side elevation of the some. Fig. 10IS a sectional view'telzen relatively on a line of Fig 9. 11

a. sectional view taken on a line 2--c of Fig. 2. v

Referring now more particularly to the characters of reference on thedrawings, 1 designates a crank shaft of on engine having the usualclutch 2 at its outer iac receive the starting crenlr;

Eaton, in the county of San Joaquin,-

The starting crank of my improved device is constructed substantiallyWith a handle 3 having a projecting sleeve 4 in which is a freely.turnablc pin'5 held against longi- Pat'ented Nov.. '7, 1911.

hu'lincl movement by means of a set'screw 6 projecting through thesleeve linto the groove 7 in said pin 5. The inner end of said sleeve 4has a shoulder 8 normally op-- crating against a spring 9 disposedaround the pin 5 the other end of said spring 90peraiing against ashoulder 10 on the collar 11 forming a pert of the pin 5, the inner endof said pin 5 having aclutch 12 to en-.

gage the clutch 2. In cranking the engine the hendle ii is operatedhichcauses the sleeve & to operate against the spring *9 to turn thecollar 11 and incidentally the pin 5 which being clutched to the crankshaft 1 by the clutches 12 and 2 turns such crank shaft as isdesired.

Now when the engine back fires and the crankshaft 1 reverses from itsnormal for- Ward movement, I throw the two clutches 12 and 2 out ofengagement with each other by means of the following structure, viz:Suitably mounted on the crank shaft 1 is s cone 13- hnving a flange 14;screwed into n box. 15 having racchets 16 engaged by pawls 1'3 pivoiellysecured in the ratchet box 18 which is secured to the shaft 1. pu vvls17 are held normally in engagement with the mic-hots 16 by meansofwsprings 19, the lower ends of said pawls projecting into the box 18,such pevvls 17 being adapted to iurn the box 15 when the shaftr 1 turnsback Weird henihemotor buck fires.

Thisbox loprojects from the member 11 andis held in position thereon bymeans of flanges 20 and 21' which secure the member 15 to a flangoorcollar 22 on the said collar 11.

Now when the engine back fires and the pelvis 17 engagingthe ratchets 16turnihe box lo es described; the same is pulled for Werd'by reason ofthe pins" 23 moveblein curving slots 24 in a box 25 fixedstationeryvvitb. respect to the other parts of the crank by means ofstraps 25 adapted to be connected with the frame of the motor or theframe of the vehicle. to whichth motor is attached. This forwardmovement causes the cono'13 to move in between the paWls 17 and spreadthem apart thus disengagingthem from the ratchets 16 and permitting thecrank shaft 1 and box 18 to turn freely and the clutches 12 and 2 havingbeen in She meantime disengcged by reason of the The box 15 moving thecollar 11 and putting its disconnected parts forward, the sleeve 4 andhandle 3 having been held stationary during this operation by reason ofdogs 26 engaging ratchets 27 on said sleeve 4, said dogs 26 beingmounted in the box 28 and held normally in engagement with said ratchets27 by means of springs 29. a The first start of the backward movement ofthe crank 1 is received by the spring 9 which overcomes any tendency totearing apart,.

the set screw 6 would impinge in order to operate the parts if thetension of the spring 9 was a little too weak.

From the. foregoing description it will readily be seen that I haveproduced such a safety starting crank as will not recoil with the backfire of the engine, but which will remain stationary and be immediatelydisengaged with the crank shaft when the back fire occurs.

lVhile this specification sets forth in detailthe present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention.

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is:

1. In a device of the character described, the combination of a crankshaft, a starting crank comprising a handle, a sleeve on said handle,apin projecting into said sleeve in a freely turnable manner, meansholding said pin against longitudinal movement in said sleeve, ashoulder on saidsleeve, a collar on the end of said pin at a spaceddistance from said shoulder, posed between said shoulder and said collara means on said collar for engaging said crank shaft, and meansinterposed between said crank shaft and said sleeve for disengaging saidengaging means on said collar from said crank shaft when said crankshaft moves backward as described.

2. In a device of the character described, the combination of a crankshaft, a starting crank adapted to engage said crankshaft, a box securedto said starting crank and a spring interprojecting over said crankshaft, an internal ratchet wheel on said box, pawls secured to saidcrank shaft and adapted to engage said ratchet wheel and turn said boxwhen said crank shaft moves backward, a means operating within said boxand adapted to throw said pawls out of engagement with said ratchetwheel when said crank shaft moves backward and means for throwing saidstarting crank out of engagement with said crank shaft when said boxturns as described.

3. A crank shaft, a starting crank adapted to engage said crank shaft,an internal ratchet wheel, a box secured to said crank shaft and havingpawls engaging said ratchet wheel, a cone slidable on said crank shaftand secured to said ratchet wheel, means for sliding said cone forwardwhen said crank shaft turns backward whereby said pawls will bedisengaged from said ratchet wheel, and a means for connecting saidratchet wheel with said starting crank whereby when said Come andratchet wheel moves forward, said starting crank will be disengaged fromsaid crank shaft as described.

In testimony whereof I afiix my signature, in presence of two witnesses.

CHARLES R. ELLIS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents;

Washington, D. G.

